Proposal for new module: "account_invoice_discount_display_amount_no_tax"

[samoros1]

Hi!
I've been recently using the "account_invoice_discount_display_amount" module. The functionality of this module is too show the total discount amount applied to an invoice, both in the backend (dispayed in a form view) and the invoice PDF repot.

Nevertheless, the discount in this module includes taxes. Some business prefer to have no taxes included in this discount.
I think it would be useful to have this option to choose between the current module ("account_invoice_discount_display_amount") and the possibility of the new module ("account_invoice_discount_display_amount_no_tax").

Would this be useful? I look forward to hearing some feedback!
Thanks.